Exhaust-muffler.



Ptenieu Nov. 25, |902.

No. 7|4,|2a.

w. BARBER. EXHAUST MUFFLER.

(Appliction le'd Jan. 23, 1902.) v

(No Model.) 3 Sheets-Shet I.'

INVENTOR ql WMM WITNESSES Patented Nov. l25, |9u2.`

N0. 7|4,l28. M W. BARBER.v

EXHAUST muFFL'En.

(Application Bled Jan. 23, 1902.) (No Nudel.) 3 Sheets-V-Sheat 2.

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NQ; 714,128. Y Patented Nov. 25, |2902."

4w. BAB-BER.

laxmms'` muFFLER.

(Application filed Jan. 23, 1902.)

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(N0 Modal.)

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1A UNITED STATES PATENT OFFICE.

WILLIAM BABBER, OF BROOKLYN, NEW YORK.

EXHAUST-MUFFLER.

SPECIFICATION forming part of Letters Patent No. 714,128, dated November25, 1902. Application led January 23, 1902. Serial No. 90,925. (Nomodel.)

To @ZZ whom it may concern.-

Beit known that I, WILLIAM BARBER, a citizen of the United States,residing at the borough of Brooklyn, in the county of Kings, city andState of New York, have invented a certain new and useful Improvement inEX haust-Muftlers, of which the following is a specitcatiomsuch as willenable others skilled in the art to which it appertains to make and usethe same.

The object of my invention is to provide an exhaust-muffler of smallbulk, of an exceedingly simple and cheap form of construction, whichwhen in use will mnffle the sound of exhaust-gases admitted to the airby way of.

. the same and which Will also tend to reduce 'exhaust-pipe, with aplurality of small peripheral perforations arranged in a spiral linearound the same from adjacent to the inlet end of such pipe to withinabout one-fourth vof its length from the closed end. Around this is'coiled under tension a spiral spring of any suitable resilientspring-wire, the coils of which register with the perforations, so as tobafle the gases issuing therefrom. Parallel with this tube are arrangedsimilar perforated tubes provided with likev perforations andbaflling-springs, which are in free communication with the atmosphere atone or both ends, all of which tubes are inclosed in a tight casing insuch manner that the gases pass from the inlet or central tube throughthe perforations into the casing, thence by the like perforations intothe outlet-tubes, in each case impinging upon the baftling-springs,fromthe ends of which outlet-tubes they escape intothe atmosphere, althoughit is not to be understood that my invention is necessarily limited to adevice necessarily comprising at once all the devices and partsbeforemenpipe 4 of the motor-engine.

tioned, as such invention consists in the particular construction ofcertain devices and parts and the combination and arrangement `ofcertain devices and parts, all as hereinafnate like or equivalent partswherever found throughout the several views, and in Which- Figure l isan exterior View, looking from the side and toward theoutletend ot' thesame, of my improved I'orln of exhaust muffler. Fig. 2 is a View thereofin central longitudinal section. Fig. 3 is a View thereof incross-section on the line com of Fig. 2. Fig. 4 is aV View similar toFig. 3, save that the same is taken on the line y y, the observer ineach case looking in the direction of the arrow in Fig. 2; and Fig. 5 isa view, partially in longitudinal section, of a mufer of aslightlymodiiied form of construction from that shown in the precedingfigures.

motor being usually of about two centimetersin interior diameter and ofabout twenty-five centimeters in length, the other parts being of aboutthe relative dimensions thereto shown in the drawings. Such tube orinletpipe l is provided at either end with a male screw-thread, `one ofwhich receives a cap 2, by which such pipe is tightly closed at thatend, and the other a threaded thimble 3, by which connection is madewith the exhaust- Surrounding such pipe l and held in place by endplates 5 and 6, which abut, respectively, against the cap 2 and thimble3 upon the inner side, as shown, is an annular closed casing 10, withinwhich are arranged parallel with and surrounding the inlet-pipe l theoutlet pipes or tubes 7,'Which are usually three in number, as shown,and the ends of which tit into suitable recesses 8, formed in the endplates 5 and 6 to receive them, and such outlet tubes or pipes 7 are infree communication with the IOO atmosphere by way of holes formed in andthrough the end plate 5 so as to register' therewith when in position,as shown at 1l, and sometimes also by way of similar holes in the endplate 6, as s hown in dotted lines at 1l' in Fig. 2, and the end plates5 and 6 are usually each `provided with an annular flange 9, which fitssnugly around the end of the casing 10, so as to form a tight jointtherewith. All of the parts before mentioned are formed of cast or othermetal and may of course be worked into proper shape in any way.

Each of the pipes or tubes 7 and also the inlet tube or pipe 1 areprovided with a plurality of small holes or perforations formed in andthrough the peripheral wall thereof, as shown, which are usuallyarranged, as Shown, in a spiral line which winds around such tube toabout three-fourths of the distance from the end plate 6 at the inletend of the device, leaving those portions of said tubes 1 and 7 lyingnearest to the plate 5 without any perforations, as shown. Theseperforations, which are numbered 12 in the drawings, are usually of thecircular form shown, and in any event their arrangement is such that thebaffling-springs 13, one of which encircles each of such tubes, willwhen in position partially cover such perforations, which form the solepassage for the exhaustgases from the inlet-pipe 1 into the casing 10and from the casing 10 into the outlet pipes or tubes 7, and suchsprings 13 are formed of any suitable highly-resilient material, such assteel or hard brass, and are held under tension of some slight degreeupon their respective tubes in any desired manner, usually by passingthe ends thereof through holes in the same and then clenching the end ofthe wire down against the tube, as shown in Figs. 2, 3, and 4 at 14 and15, but are sufficiently largerin diameter than the tubes which theyinclose to be able to vibrate freely when at rest, the wire out `ofwhich the same is formed being always in registry with the gas passagesor perforations 12, as shown. Usually ordinary round springwire, such asthat shown, is used out of which to form the springs 13; but flat wireor, in fact, wire of any cross-section may be used.

The operation of the device is as follows: As soon as the exhaust-gasesare forced into the inlet pipe or tube l they pass clear to the end ofthe tube, where the unperforated portion of the tube forms anair-cushion chamber, which causes a series of oscillations back andforth of the compressed gases so rapid as to be almost incalculable, butsufficient to cause the same to flow out at right angles by slow degreesthrough the perforations or passages 12, on passing through which thesmall jets of gas impinging against the resilient wire of the springs 13are baffied in their outfiow to a certain extent, thereby putting suchsprings into rapid vibration, a phenomenon which is also repeated in thepassage of such gases into the tubes 7, from which they at last findtheir way to the atmosphere by way of the end outlet-orifices 11.

In the modified form of construction shown in Fig. 5 I have shown asomewhat simpler form of exhaust-muffler of myimproved type, which mayin many cases be used with good eect, wherein the outlet-tubes 7 areomitted, the inlet-tube 1 being retained and the gases passing from suchtube by way of the gaspassages 12, by the baffiing-spring 13 directlyinto the casing 10, from which they escape into the atmosphere by way oforifices 16, formed in the end plate 5, and by like orifices or passages17, formed in the peripheral wall of the casing 10, as shown, one orboth of which outlets may be used, as may be desired.

Many modifications other than those shown and described may be madewithout departing from the scope of my invention, and I do not intend tolimit myself to the exact constructions set forth; but,

Having now particularly described my said invention,its construction andoperation,what I claim, and desire to secure by Letters Patent, is-

1. An exhaust-muffler provided with an inlet pipe or tube havingperforations in its peripheral Wall, and a baffling-spring of resilientmaterial coiled around the inlet pipe or tube in such manner that thegases as they emerge from the peripheral perforations or passages willimpinge upon the spring, substantially as shown and described.

2. An eXhaust-muffier provided with an inlet pipe or tube havingperforations in its peripheral wall, and having at its extreme end aportion having an imperforate peripheral wall and end so as to form acushioning-chamber, and a baffling-spring of resilient material coiledaround the inlet pipe or tube in such manner that the gases as theyemerge from the peripheral perforations or passages will impin ge uponthe sprin g, substantially as shown and described.

3. An eXhaust-muffier provided with an inlet-pipe provided withgas-passages formed in the peripheral wall, an outlet-pipe locatedadjacent to, outside of, parallel to, and non-concentric with theinlet-pipe also provided with like perforations or gas-passages in itsperipheral wall and in communication at the end with the atmosphere, anda casing inclosing the inlet and outlet pipes in such manner that thegases on their way to the atmosphere pass through the peripheralpassages of both the inlet and outlet pipes, substantially as shown anddescribed.

4. An exhaust-muffler provided with an inlet-pipe provided withgas-passages formed in the peripheral wall, an outlet-pipe locatedadjacent to the inlet-pipe also provided with like perforations orgas-passages in its peripheral wall and in communication at the end withthe atmosphere, a coil-spring of resilient ma- .terial surrounding theinlet-pipe, and a like spring surrounding the outlet-pipe, and a closedcasing surrounding the inlet and out- IOO IIO

let pipes, the construction and arrangement being suchA that the gaseson passing out of the peripheral perforations or gas-passages of theinlet-pipe and into the like passages of the outletpipe, will beretarded or bafiied by the springs, substantially as shown anddescribed.

5. An exhaust-muffler consisting of an exterior casing, an inlet-pipeprovided with gaspassages in the peripheral Wall surrounded by thecasing, a coil-spring of resilient material surrounding the inlet-pipe,a plurality of outlet-pipes located within the casing parallel to and ondierent sides of the inlet-pipe provided With like peripheralgas-passages and in communication with the atmospherel by way oforifices in registry with the open ends thereof lin the end Wall of thecasing, and a bailing spring of resilient material coiled around each ofsuch inlet and outlet pipes so as to baffle the ow of gas through theperipheral gas-passages, substantially as shown and described,

6. In an eXhaust-muflier, the combination.

with an annular outer inclosing shell forming the peripheral Wall of theexterior casing, of an end plate provided with a central orifice adaptedto fit over one end ofthe shell, a similar end plate provided with alike central oriice and also with a plurality of perforations concentricthereto adapted to fit over the other end of the shell, outlet-tubesopenat the ends similar in number to the outer perforations peripheralWalls thereof arranged in a spiral line, an inlet-pipe also perforatedin like manner with an imperforate portion adjacent to the end platehaving the outer perforations passing through the central orifices ofthe end plates and secured thereto and securing the end plates to theends of the shell forming the exterior casing by a screw-threaded cap atthe imperforate end and a screw-threaded thilnble at the other, and aspiral bafflingspring seeured at the ends within the casing surroundingeach of the inlet and outlet tubes or pipes in such manner that the Wireforming the same registers with the line of spiral peripheral holesthereof, substantially as shown and described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

WILLiAMv BARBER. i

Witnesses:

C. L. DAVIS, A. S. BARBER.

